Designed for big cubic-inch engines

NOTE2: These high-performance items are not eligible for any further discounts or promotional pricing.

SHIP NOTE: This item as packaged measures over 48" in length, and/or 30" in width or height and is subject to an additional handling surcharge of $12.95.

Additional Handling Surcharges

Any package that measures over 48" in length, and/or 30" in width or height, is subject to an additional handling surcharge of $12.95. Unusually-shaped packages such as cylinders or drums are also subject to this charge, as are unusual exterior packaging materials such as plastic or cloth.

As one of the most powerful exhaust systems for A-Bodies with large displacement engines, the Flowmaster “American Thunder” system features heavy-gauge mandrel-bent tubing and “Super 40 Series” mufflers. The tailpipes included are two-piece and install easily. The kit also features an adjustable crossover pipe to fit a variety of applications and has all the hangers and clamps that fit in the factory locations. The 1964-67 kit exits the tailpipes behind the rear wheels pointed at the ground, while the 1968-73 and 1964-73 kits exit out the back at the bumper. Get the power and sound of performance with the Flowmaster American Thunder exhaust system.